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The venerable Time To Interactive (TTI) metric is being removed in Lighthouse 10, with its 10% score weight shifted to Cumulative Layout Shift (CLS), which will now account for 25% of the overall performance score. Ideally this change will increase focus on CLS for sites that still need fixes for unnecessary layout shifts.
Same page tested on PageSpeed Insights over a few hours the same day, without anything modified, and the desktop scores vary from 19 to 59… 🤷♂️
A lot of businesses rely on this crap to now if their site is "fast" enough for Google SEO! 😭
width and height attributes on <img> help prevent layout shifts (CLS). Values should be unitless integers.
But #Lighthouse sees 100% as 100, thanks parseInt()…
Do you think it should be improved?
Looks like getting 4 💯 #Lighthouse scores in #Speedlify is more difficult than before… 🤔
Anyway, thanks again @zachleat for this great tool!
https://perf.nicolas-hoizey.com/nicolas-hoizey.photo/
The Art of Deception, Lighthouse Score Edition
I agree with Zach that the Lighthouse scores we see - shared mostly on Twitter - should be taken with a grain of salt, as they are often shared without any mention of the test conditions.
Big picture performance analysis using Lighthouse Parade
Here is a great new open source tool provided by the Cloud Four team! 👍
Do anyone know why Google made it mandatory for #PWA icons to be PNG, not JPEG or other?
This is what #Lighthouse requires, but I couldn't find any docs about this. #MDN says other formats are fine.
Looks like #Lighthouse now suggests me to preconnect to the Google Analytics domain…
…which I already do! 🤔
Anything wrong with my HTTP header?
Use Speedlify to Continuously Measure Site Performance
If you don't have any budget for Dareboost (or competitors) yet, Speedlify can help you monitor your site's performance for free, and build your performance strategy to justify using even better tools:
Using speedlify with #Netlify is great, because enhancing the sites performance will reduce the build times, therefore the monthly cost… 😁
This new monitoring tool based on #Eleventy, built by @zachleat, is awesome! 😍
New project: Speedlify 🐇
A self-hosted dashboard to continuously measure and publish web site performance statistics using Lighthouse and Axe.
Demo:speedlify.netlify.app/ssg/c
Blog post:www.zachleat.com/web/speedlify/L
It took me just a few minutes to built my dashboard for multiple sites:
https://webperf-monitoring.netlify.app/
Lighthouse changes how Performance Score is calculated
Lighthouse 6 is the first major release of the popular auditing tool since May 2019, introducing critical changes that will impact everyone relying on the scoring. Remember, the PageSpeed Score (which contributes to your SEO ranking) is the same as the Lighthouse Performance Score.
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Brendan Kenny
Zach Leatherman
Emerson Loustau
Karolina Szczur